Sheet detector



Oct.23,1928. 1,688,789 S. A. COMISKEY SHEET DETECTOR Filed Nov. 20, 1924 4 Sheets-Sheet 1 F'IG.2.

Oct. 23, 1928.

s. A. COMESKEY SHEET DETECTOR 4 Sheets-Sheet 2 Filed Nov. 20, 1924 Oct. 23, 1928.

S. A. COMISKEY SHEET DETECTOR Filed Nov. 20, 1924 4 Sheets-Sheet 5 INVENTOR Oct. 23, 1928.

. L68 789 s. A. coMlsKEY SHEET DETECTOR Filed Nov. 20, 1.924 4 Sheets-Sheet 4 Patented Oct. 23, 1928.

UNITED STATES;

rAsri'r orrica.

STANLEY A. COMISKEY, OF SEATTLE, WASHINGTON, ASSIGNOR TO B. HOE & 60., ING', OF NEW YORK, N; Y., A CORPORATION OF NEW YORK.

SHEET DETECTOR.

Application filed November 20, 1924. Serial No. 750,983.

T he invention relates to certain improvements in detector mechanism for stop-ping a web handling machine in case of a break in a web, such as a prlnting press.

In certain web handling machines, such as printing presses, it is very desirable to stop the machine in case of a break in the web to prevent web wastage.

Detector mechanisms have been employed to ell'ect this, a movement of the detector caused by a break in the web operating a switch or like device which stops the machine. With such mechanisms, however, as has heretofore been used, it has been necessary to reset theswitch mechanism by hand after it is operated. In large web handling machines, such as multi-couple printing machines, a large number of these detectors are used at different points in the machine. Heretofore, after a break in the web and the web has been again threadel through the machine, it has been necessary for the pressmen to hunt around to find which detector is out. that is, which detector needs to be reset. Where a considerable number of these mechanisms are used, therefore, aconsiderable amount of time is lost in locating the detector that needs to be reset before the running of the machine can again be resumed;

It is a special object of the present invention to provide a detector mechanism which will indicate a break in a web and will act to stop the press, and which will automatically reset the switch mechanism in operative position, after it has functioned to stop the machine, so that the pressmen will not have to waste time in looking for the detector which has caused the stoppage ot the machine.

A further object of the invention is to provide a mechanism in which the detector member may be locked in an inoperative position for convenience in threading a web through the machine, or for any other desired purpose.

lit is a further object of the invention to provide a detector mechanism which shall be small in construction and accurate in operation, and which may be readily positioned in the machine with which it is to be used.

With these and other objects not specifically referred to, theinvention consists in certain novel parts, arrangements and combinations which will be described in connection with "threading of the web;

Figure 1 is a side View of the detector an osieeler mechanism showing the arts in the tion they occupy when t e detector or member is in contact with the web;

Figure 2 is a similar view showing the parts in the position they occupy when a break in the web has caused the detector mechansm to operate;

Figure 3 is a View showing the position of the parts after such break, anl in which the switch mechanism has been automatically '70 returned to operative osition;

Figure 4 is a view s owing the position of the parts when the detector feeler is lifted out of the way and looked to permit free Figure 5 is a plan view on a somewhat enlarged scale, the View being taken on the line 5-5 of Figure 3, looking in the direction of the arrow 3 in that figure;

Figure 6 is a detail sectional view of the 8" switch mechanism, the switch being shown in on position;

Figure 7 is a View similar to Figure 6 showing the switch in ofi position, and

Figure'S is a diagrammatic View of ass printing machine showing one way in which the detector may be associated therewith;

this figure also showing the drivin motor tor the machine and the motor and switch c1rcu1ts.

While the construction selected to illus tary printing couple, the cylinders of which are marked 3, 4t and its inking mechanism 5; a second printlng couple, the cylinders of which are marked 7, 8 and the inking mechanisms 9; a third printing couple, the cylinders of which are marked 10, 11 and the inking mechanism 12, and a fourth couple, the cylinders of which are marked 13, 14 and the linking mechanism 15. These printing side frames 1, 2, in which is supported a rom driving connections from the motor being of any suitable character, as a belt 16 and a pulley 1 7 on a line shaft 18, connections from the line shaft to-the printing couples being by means of miters 19, 20, 21, 22.

Two of these presses, as the presses 3, 4, 7,

8, are shown as each provided with a detec- '34, before referred to.

tor mechanism, indicated generally by D,

these detector mechanisms being in circuit with the motor through circuits a, b and switch a, so that by the operation of these detector mechanisms the motor and, consequently, the press are stopped.

It will be understood that as many of these detector mechanisms as may be de-' sired will be sup lied at various points in.

the machine, two aving been shown in Fig. 8 as illustrative of the invention, such mechanism all being in circuit withthe driving motors of the press. a

The specific construction of the detector mechanism may vary, but a preferred construction is that shown in the drawin s, and such a construction will now be r? scribed.

The detector mechanism shown includes a twoart casing 23, 24, the parts of the casing ein secured together in any suitable manner, as bolts passing throu h ears 26, 27 former? on the casing walls. T e base of the casi is provided with extensions 28, 29 to WlllCh are secured by bolts 30 end bracket 31, 32 (best shown in Fi 5) by which the casing is supported in t e frame of the machine, as shown in Fig. 8. The outer part 23 of the casing is provided with a pair of spaced legs or extensions 33, 34, having at their outer ends bearings 36 for a stud 37, this stud being secured in place by a cotter pin 38. Pivotally mounted on this stud is-a hub 39 having a flat plate arm 40 to which is secured, by screws 41, a detector membershown in the form of a feeler finger 42 having a curved end 43 which norma ly engages with the web. The hub .39, opposite the p ate arm 40, is provided with a striker 44 having a rounded end 45, this striker working inthe space between the legs 33,

Located in the casing is a switch mechanism which is operated by the striker when the detector is moved due to a break in the I web, the striker acting to throw the switch p the st and cut out the driving motor. While this switch mechanism may be of any suitable character, in the best constructions it will be a sprin ioperated mechanism, so that when r1 er is moved out of the way the switch will automatically return to operative position. a In the specific structure illus trated, this switch mechanismincludes a block 46 in which seats, at one end, an actu ator or push-rod 47, this push-rod being surrounded by a spiral spring 48. This push-rod at its outer end, or its left hand end looking at Fig.- 6, carries a button 49.

contact flange 51 which is dimensioned to make contact with two contact members 52, 53, these members, as shown, being in the form of upri hts having inturned contacting ends 54. base standards, at their lower ends, are formed with legs 55 and are secured on the block 46 by binding posts 56, which also carry the usual binding nuts 57, 58 by which the wires (1, b are secured in the switch. If desired, stops 59 may be provided for limiting the inward movement of the plunger so that button 49 vwill not be forced through the wall of the casing.

With the construction so far described, it will be seen that when the detector drops to the position shown in Fig. 2 the point 45 of the striker 44 enga es the push-button, forcing the latter into t e casing and then forcing the contact flan e 51' away from the contact faces 54 of t e contacts 52, 53;

thus breaking the circuit and stopping the' motor. In accordance with the invention, means are provided whereby, after this has occurred, the detector is operated so that the striker is freed from the push-button and the switch is allowed to resume its normal or operative position. While this may be accomplished in various ways, in the particular construction illustrated, devices are employed which are actuated by the downward movement of the detector member to on which is secured an arm 62, one end of. 4

this arm 63 forming a support for the air cylinder 60. I

The piston rod 64 of the air cylinder has afsplit ead 65 which is connected by means 0 a by a olt 68 to the other end 69 of the arm 62, before referred to. This arm 67 has a recessed or slotted end 70 to receive the end in 66 to an arm 67 pivotally secured of a second arm 71 which is pivotally connected by a screw bolt 72 to a'plate 73 secured to the upper surface of the detector finger 42, before referred to. The upper end of the arm 71 is slightly enlarged, as indicated at 74, so that 1t w1l1 not pull through the slot 7 0 in the outer end of the arm 67.

In the best constructions, to assist the movement of the air cylinder, the outer end of the arm 67 may be provided with a weight 75 adjustably supported on the arm by a set screw 76, astop 77 bein provided for preventing the weight from eing accidentally displaced from the end of the arm.

With the construction described, it will be seen that the dropping movement of the detector finger raises the arm 67 on the fulcrum 68, raising the plunger of the air cylinder and compressing air in the cylinder. As soon as the parts have reached the position shown in Fig. 2, the air pressure in the cylinder and the weight cause the parts to assume the position shown in Fig. 3, that is, a lifting movement is given to the detector member, this movement being suflicient to cause the end 45 of the striker 44-to free itself from the push-button 4:9. The spring 48 in the switch mechanism then returns the sary to manually throw the switches of the detector mechanisms.

Itmay be desirable under some circumstances to lift the detector up out of the sheet path and hold it in such elevated position so that a web may be conveniently threaded through the machine. While this may be accomplished in various ways, as shown, the casing of the switch mechanism is provided with a stem 78 on which is provided a latch arm 79 with a hook end 80 which may be hooked under the detector feeler 42 and'the parts latched in the position shown in Fig. 4.

While the invention has been shown and described in its preferred form, it will be understood that various changes may be made in the specific construction and arrangement of the parts without departing (ill device associated with the member and acting to move the member to cause the return of the switch to normal operative position.

4. In a web handling mechanism, the combination of a detector member located to contact with a web and movable from the web path on breakage of a web, means controlled by the detector member to stop the machine, means for automaticallyreturning the controlling mechanism to operative position, and means for positioning the detector member in inoperative position.

5. In a web handling mechanism, the combination'of a detector member located to contact with a web and movable if a web is broken, an electric switch operated by the detector member to cause stoppage of the machine, means for automatically returning the switch to operative position, and means for positioning the detector member in inoperative position.

6. In a sheet detector mechanism, the combination of a detector member, a switch actuated by a movement of the member, and means for moving the member to return the switch to operative position, said means acting through power produced therein by the movement of the detector member.

7. In a sheet detector mechanism, the combination of a detector member, a switch operated thereby, and a fluid pressure device associated with the member for returning the switch to operative position, the pressure in the device being produced by the movement otthe detector member.

- 8. In a sheet detector mechanism, the combination of a detector member, a switch operated thereby, a fluid pressure device for returning the switch to operative position, the pressure in the device being produced by the movement of the detector member,

and a weight cooperating with the pressure device. I

9. In asheet detector mechanism, the

combination of a movable detector member,

ative position.

10. In a sheet detector mechanism, the combinationof a movable detector member,

an electric switch connected therewith, a finger carried bythe member and acting to throw the switch, an air cylinder for moving the finger out of contact with the switch 5 so that the latter may return to operative position, and a weight for association with the cylinder. i

' 11. In a detector mechanism, the combi- -nation of a detector member, a casing by 1 which the detector member is carried, a

switch mechanism in the casing, a part car-,

- ried by the detector member and acting to throwofi the switch, and fluid pressure de-' vices associated with the casing for moving the part out of contact with the switch so that the latter may return to operative position.

V 12. In a detector mechanism, the combination of a detector member, a casin to which the detector member is secure a switch mechanism in the casing including a plunger, a part carried by the detector member and engaging the plunger to throw the switch, and an air cylinder associated with the casing and acting to move the part out of engagement with the switch, said air cylinder having air therein put under pressure by the movement of the detector finger.

- 13-. In a detector mechanism, the combination of a detector member, a casing to which the detector member is secured, a 'switchmechanism in the casing, a part carried by the detector member and-in contact with the switch to throw the same, an air cylinder associated with the casing, an arm pivotally connected with the casing, to which the air cylinder is connected, and a second arm connected with the first arm and with the detector member. a

14. In a detector mechanism, the combination of a detector member, a casing by which the detector member is carried and having means for securing it in operative position in a press, a switch mechanism in the casing, means operated by the detector 'member to throw off the switch, and a fluid the switch, and a spring for moving the switch to on position.

16. In a stop mechanism for printing presses, the combination of a detector member movable on breakage of a web, means controlled by the detector member to stop the press, and means put under compression by the movement of the detector member and acting to cause a return movement of the member for automatically returning the controlling mechanism to operative position.

17 In a stop mechanism for printing press, the combination of a detector'member movable on breakage of a web, means controlled by the detector member to stop the press, and mechanism put under compression by the movement of the detector memher for effecting a movement of the detector member for causing the return of the controlling mechanism to operative position.

In testimony whereof, I have hereunto set my hand.

' STANLEY A. COMISKEY. 

